Donald Trump Rips Jerry Seinfeld for Canceling Show

Donald Trump has launched a blistering attack on Jerry Seinfeld, angry that the comedian canceled an appearance for Trump's son's charity because of politics.

According to a report on "Page Six" of the New York Post, Seinfeld was supposed to appear at a September 13 event for the Eric Trump Foundation, which will benefit St. Jude Children's Research Hospital.

However, Seinfeld pulled out because of Trump's recent media appearances in which he questioned President Obama's birthplace and citizenship.

"Jerry feels this kind of demagoguery has no place in public discourse... He has respectfully withdrawn from the event, and is making a contribution both to the Eric Trump Foundation and to (St. Jude)."

Trump was not happy, writing a scathing letter to Seinfeld on Wednesday, which read in part:

I just learned you canceled a show for my son's charity because of the fact that I am being very aggressive with respect to President Obama, who is doing an absolutely terrible job as our leader.

We don't care that you broke your commitment, even though the children of St. Jude are very disappointed, and despite the fact that your manager clearly stated you are "truly a man of his word."

What Trump does care about is that he did a favor for Seinfeld, appearing on his "failed" TV show "The Marriage Ref" last year:

What I do feel badly about is that I agreed to do, and did, your failed show, "The Marriage Ref," even though I thought it was absolutely terrible... Despite its poor ratings, I didn't cancel on you like you canceled on my son and St. Jude. I only wish I did.

You should be ashamed of yourself!

Seinfeld agreed to the appearance in January, months before Trump announced a possible presidential run and went on every TV news show in the land to blast Obama and give new life to the birther movement.

Bret Michaels is taking over his slot -- can't wait to hear his stand-up routine.